Overview
The INA128UA is a low-power, general-purpose instrumentation amplifier produced by Texas Instruments. It is part of the INA12x series, which includes the INA128 and INA129 models. These amplifiers are known for their excellent accuracy and versatility, making them suitable for a wide range of applications. The INA128UA features a three op-amp design and current-feedback input circuitry, providing wide bandwidth even at high gain settings. It is available in 8-pin plastic DIP and SO-8 surface-mount packages, with an operating temperature range of –40°C to +85°C.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Offset Voltage | 50 | µV |
| Offset Voltage Drift | 0.5 | µV/°C |
| Input Bias Current | 5 | nA |
| Noise | 8 nV/√Hz, 0.2 µVpp | |
| Common Mode Rejection Ratio (CMRR) | 120 dB | |
| Bandwidth | 1.3 MHz (G = 1) | |
| Input Protection | ±40 V | |
| Supply Voltage Range | ±2.25 V to ±18 V | |
| Quiescent Current | 700 µA | |
| Operating Temperature Range | –40°C to +85°C | |
| Package Type | 8-pin plastic DIP, SO-8 |
Key Features
- Low offset voltage: 50 µV, maximum
- Low drift: 0.5 µV/°C, maximum
- Low input bias current: 5 nA, maximum
- Low noise: 8 nV/√Hz, 0.2 µVpp
- High CMRR: 120 dB, minimum
- Bandwidth: 1.3 MHz (G = 1)
- Inputs protected to ±40 V
- Wide supply range: ±2.25 V to ±18 V
- Low quiescent current: 700 µA
- Packages: 8-pin plastic DIP, SO-8
- Single external resistor sets any gain from 1 to 10,000
Applications
- Pressure transmitter
- Temperature transmitter
- Weigh scale
- Electrocardiogram (ECG)
- Analog input module
- Data acquisition (DAQ)
Q & A
- What is the maximum offset voltage of the INA128UA?
The maximum offset voltage is 50 µV.
- What is the input bias current of the INA128UA?
The input bias current is 5 nA, maximum.
- What is the bandwidth of the INA128UA at a gain of 1?
The bandwidth is 1.3 MHz at a gain of 1.
- What is the common mode rejection ratio (CMRR) of the INA128UA?
The CMRR is 120 dB, minimum.
- How is the gain of the INA128UA set?
A single external resistor sets any gain from 1 to 10,000.
- What are the available package types for the INA128UA?
The available package types are 8-pin plastic DIP and SO-8.
- What is the operating temperature range of the INA128UA?
The operating temperature range is –40°C to +85°C.
- What are some typical applications of the INA128UA?
Typical applications include pressure transmitters, temperature transmitters, weigh scales, electrocardiograms (ECG), analog input modules, and data acquisition (DAQ).
- What is the quiescent current of the INA128UA?
The quiescent current is 700 µA.
- How are the inputs of the INA128UA protected?
The inputs are protected to ±40 V.
